Power rock-drill.



F. P. PORTER.

POWER ROCK DRILL.

APPLICATiON FILED MAR. 1, ms.

1 1 40, 1 85 Patented May 18, 1915.

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O W/TNEILSES OR G. Frederick, Rp

ATTORNEYS F. P. PORTER.

POWER ROCK DRILL.

APPUCATION FILED MAR. 1, 19231 Patm'xtod May 18, 191:).

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memo; mm mm. 1. 1913. 7 1,140,185. Patented May 18, 1915.

. 3 SHEETS-SHEET a INVENTOR WITNESSES l a G.W Frederick P. Per-fer- M momma FREDERICK PERLEY PORTER, OF KELLO GG, IDAHO.

POWER ROCK-DRILL.

Specification of Letters Patent.

Patented May 18, 1915.

Application filed amt 1, 1913. Serial no. 751,441.

To all whom it may; concern Be it known that l, FREDERICK P. PORTER, a citizen of the United. States, and a resident of Kellogg, in the county of Shoshone and State of Idaho, have invented a new and Improved Power Rock-Drill, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved power rock drill of the hammer type and which is especially adapted for drilling holes in the sides and roof of a mine. and which is arranged to reduce vibrations to minimum. thus allowing easy handling of the machine without undue fatigue on the part of the operator and to withstand hard usage. 7

For the purpose mentioned use is made of a cylinder containing a hammer piston and provided with ports, a main admission and exhaust valve controlling the said cylinder ports and controlled by pressure from within the cylinder, a throttle valve connected with a source of pressure. supply and connected with the said main admission and exhaust valve, a feed cylinder attached to the throttle valve. and a slide bar' movable in the said feed cylinder and controlled by the motive agent passing through the throttle valve to the main admission and exhaust valve as well as to the feed cylinder.

A practical embodiment of the invention is represented in the accompanying drawforming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a side elevation of the power ock drill; Fig. 2 is a plan view of the same; Fig.3 an enlarged cross section of the same on the line 3-3 of Fig. l Fig. 3 is a like vimvol' the lower end of the feed cylinder and slid-:2 oar; Fig. -l isan enlarged ectional side elevation of part of the power -o l drill the section being on the line 4l of l ig. 10; Fig. 5 is a cross section of the same on the line 55 of Fig. 10 and showing: the hammer piston in lowermost position: Fig. t3 is a similar view of the same showing the main valve shifted. and the hammer piston in uppermost p sition, the scrtidn being on. the line $43 of Fig. 10; F in. 7 is a cross section of the same and similar to Fig. but with the hammerpiston in uppern'sost position; Fig. 8 is a simi lar view of the same on the line 3-8 of Fig. 10; Fig. 9 is a sectional plan view of the throttle valve; and Fig. 10 is a sectional plan view of the main admission and exhaust valve and the mulller, the section being on the line 10-l0 of Fig. 4:.

In the main cylinder of the barrel A is mounted to reciprocate a piston 15 adapted to strike with its upper end against a tappet- C mounted to slide in a reduced portion A of the cylinder A the said iappet O having a head 0' adapted to be seated in the portion A of the cylinder, and which is slightly enlarged relative to the portion A, so as to prevent the tappet C from dropping down too far. The head (7 of the tappet (J is adapted to strike against the terminal of the shank of the drill I) mounted to slide in a chuck E held in the upper tapering bore A? of the cylinder A and removably fastened in place therein by a cap E" and bolts E plainly indicated in Figs. 1, 2 and 3.

The lower end of the hammer piston 13 is provided with a reduced portion or a pin B adapted to pass into a central port a formed in the cylinder head A closing, the lower end of the main cylinder A. Against the cylinder head A abuts the main admission and exhaust "alve F surrounded by a muftier shell Gr spaced from the exterior surface of the valve F to form an annular chamber i into which passes the exhaust motive agent from the cylinder A to mufllc the exhaust, as hereinafter more fully explained. Against the bottom cap F of the main admission and exhaust valve F and against the lower end of the mulller shell (l abuts the upper end of the casing ll of a throttle valve H connected with an inlet I to which a hose is secured for conducting the motive agent, such as compressed .air, into the throttle valve ll. from which the motive agent is directed into the main admission and exhaust valve F to pass into the ends of the cylinder A with a view to reciprocate the hammer piston ll therein, as hereinafter more fully explained. on the inlet I is secured a horizontally-extending handle J adapted to be taken hold of by the operator for turning the power rock drill during the drilling operation to facilitate the boring of the hole by the drill D.

To the lower reduced end H of the casing H of the throttle valve H is secured the upper end of a feed cylinder K by the use of a yoke L, and in the said feed gyhnder K mounted to reciprocate a piston'N to which is secured a slide bar 0 passing through a cap K attached to the lower end of the I 1 cylinder K. as plainly indicated in l 1 and 3. The outer end. of the slide bar 0 preferably provided with a point 0" ads, ed to he set on floor of th: mine to yieldingly support the power drill during the drilling operation and to feed the drill D in the drill hole. The yoke L is fitted onto the ca; ng ll of the throttle ynlve and. prov -d with an exterior l1 connected by bolts L with an inte flange A. arranged on the lower end 4') f the main cvlinder A so as to securely fasten the feed cylinder K to the throttle valve casing H, and to hold the throt-clc valve H, the main va ve F and the nnifiier shell G position on the cylinder A and in axial alinemcnt therewith, as will be readily understood by reference to the drawings.

The ing F of the main admission and exhaust. valve F is provided with two con-- centric horeq F and F, in which is mounted to slide :2. piston valve having a shank F and pistons F, l and F, of which the pistons l! and F lit into the bore 1? While the larger piston Ff fits into the bore F which latter is closed by the cap F. The lower end of the stern F extends into a, bearing F formed in the can F so as to insure an easy up and down sliding of the piston valve in the casing 1. into the upper smaller portion F lend annular ports 5. c, d and c and into the larger lower bore F leads an annular port f. The upper port Z) is connected by diametrically arranged ports 5' with vertical channels 7) formed, in the Gas ing F and in the cap F to connect at their lower ends with channel 5 formed in the top of the throttle valve casing H underneath the cap l Fig. 4:): and the'said channel h is connected by a cxantral port 5 with 2.- port 7? leading to the recess 11 formed in the plug ll of the throttle valve H and which, plug ll is provided at its outer end with a l'mndlc H under ihc con trol oft-he m emror. The recess H opens at all times into the inlet 1. lVhen the piston valve is in lowermost posit-ion and the plug ll" is in the position shown in Fig. 4:, then the port Zr registers with the Perth and consequently the motive agent can. pass from the inlet. I though the recess H and ports Z 51 into the channel b and up through the channels I) and ports 5 into the annular pnrl 7) and from the latter into the bore F to finally pass into the port a. thug; exerting :1 pres-3:1 re against the reduced end B of the hmmncr piston B to move the latter in an upward direction. It is understood-that when the hammer piston B moves upward the reduced portion B finally leaves the. port (I, thus allowing the motive agent to into the lower end of the cylinder A to drive the hammer piston B upward with considerable force to strike ablow on v and f are connected with each other me ics the tappet {1, which latter excrts'its force against the drill 13. During the time the hammer piston B is on the upw nd stroke the upper end of the cylinder A is connected with the annular port a, and for this upper end of the cylinder A is provided with two oppositely-arranged ports 9 leading to channels 9 formed in side Wall of the cylinder A and extending through the head A. into the valve sing F to connect with the said annularfport 0. Now when the piston valve is in lowermost position. as shown in Figs. 4 and 5. then the port a is connected with the port al by the space between the pistons F, F of the pis ton valve, and the port riconnects by die metrical ports i, with the annular chamber G formed between the mufllcr shell G and the exterior face of the casing F so that the exhaust is mnfiled.

The annular chamber G connects with a number of vertical channels H formed in the throttle valve casing H and the lower ends of the channels 'H connect with similar channels L formed in the yoke L, and the said channels L lead to an annular chamber L formed in. the lower end of the yoke L. The said chamber L has a reduced. lower end for the escape of the exhaust in a downward direction over the feed cylinder K (see Fig. 5).

' \Vhen the hammer piston B nealsthe end of its upward stroke it uncovers successively ports 2 and 21 (see Figs. 6, 7 and 8) leading to a. channel formed in the side wall of the cylinder A and extending through the head A, the valve casing F and along the top of the cap plate F to open into the bottom of the large bore F so that the motive agent in the lower end of the cylinder A can pass by Way of the ports i, z" and channel 5' into the bore F to press against the larger piston F so as to force the piston valve upward to the position shown in Figs. (3, 7 and 8. When this takes place the port a. is closed-and the ports 5 and dare connected with. each other to allow the motive agent to pass up through the channels g and by way of the ports 9 into the upper end of the cylinder A to act on the hammer piston B therein with a View to force the some down word on the return stroke.

W'hcn the piston. valve is moved into uppermost position as above described and shown in Figs. 6, 7 and 8, then the ports 6 see Fig. 8) and the port 6 is connected ith channels 6' formed in the valve casin F, the head A and the lower end of the w 11 of the cylinder A, the said channels leading .to ports 6 opening into lhe cylinder A a short distance above the head A}. The port f connects by diainctrical ports with the annular chamber G of the mnficrso that the exhaust motive agent in the lower end of the cylinder can pass out of the same by way of the ports 6, channels 0, port a, bore F port f, ports f into the annular chamber G to finally pass by way of th channels H and L and the chamber L to the outside.

It will he not-iced that during the down Ward stroke of the hammer piston ll the exhaust takes place. in the lower end of the cIvUinderA. in the manner just descrihcd until the hammer piston B closes the ports 6 and when this takes place the remaining portion of the motive agent in the lower end of the cylinder forms a cushion for the descending hammer piston B to cushion the latter, at the same time compressing the motive agent to such an extent as to force the piston valve downward back' into the original position shown in Fig. 4. \Vhen this takes place the motive agent is admitted to the lower end of the cylinder A to force the hammer piston ll upward therein, and then the above operation is repeated.

The hammer piston B when moving into a lowermost position uncovers a port 7' and when it moves into an uppermost position it uncovers a port j. The. ports 7' and j lead to a vertical channel j formed. in the wall of the cylinder A and its head A (see Fig. 4), and the lower end of the channel i opens into the annular mufller chamber G so that the upper end of the cylinder A is immediately relieved of pressure. by way of the port and channel j at the time the hammer piston B nears a lowermost position. In a like manner the lower end of the cylinder A is relieved of pressure by way of the port j and channel at the time the hammer piston 1 moves into uppermost position. The stem F of the piston valve is provided with a channel Z:- opening at its 10 vver end into the hearing: and terminating, at its upper end in a diametrical port In opening. into the small hore I* intermediate the pistons F and F so that the hearing F" is relieved of all pressure and an easy up and down slicing movement of the piston valve is had. The plug H of the throttle valve ll is provided with a port'l directly opposite the port U and leading: into the recess H. The port 5 connects hv a port 17, with the upper end of the feed cyL inder K to admit the motive agent into the said cylindcr at the time the plug: H" .is in an op n position. into the port 1 opens a feed port 0 to permit of feeding: compressed air into the uppcr end of the iced cylinder K at the time the plug ii is turned from the closed position into such a position that the ports 5 and b are still out of register with their ports and I) to allow of forcing the feed cylinder K and the parts conncctcd therewith upwardly until the point of the drill l) is in engagement with the rock. after which the plug 11 is turned into full open position to reciprocate the hammer piston B, as above described, and to feed the drill in the drill hole owing to the pressure in the feed cylinder R against the piston N. The throttle valve plug IV is provided with an exhaust groove 7) leading to the outside and adapted to register with the port Z at the time the said plug H is in closed position so that the air pressure in the feed cylinder K can pass out of the same. thus peri'nitting the drill l) to drop hack.

The piston N is provided at the top with a spring coupling lie-ad N adapted to engage a recess Il in the casing; ll of the throttle valve to hold the said piston N and the slide bar in withdrawn position witlr in the feed cyliinler K at the time the power rock drill is moved about from place to place prior to being: set up. It is understood that when pressure is admitted into the cylinder K by way of the small teed port'o, as aliove described in the drawings. the piston N is forced outward in the cylinder K and the coupling! head N is disengaged from the re cess H It is understood that the exhaust passing out of the ends of the cylinder A passes into the annular mulller chamber (l' so that the motive agent is free to expand therein. and then the exhaust passes through the channels H" and L into another chamher L in which the motive agent is again expanded to finally pass out of the chamber L into the open air, thus tln'n'oughly muiiling the exl'iaust in its outward passage. llv ex hausting the air downward in the. direction of the axis of the drill the exhaust air is not liable to spread the dust or cuttings. From the foregoing: it will lM seen that the hammer piston ll is only cushioned on the return or downward stroke and the force oi the compressed air compressed by the reduced portion ll in the compressed air port 0 now moves the piston valvc l downward into starting position to again admit the motive agent to the lower end of the cylinder A to drive the hammer piston ll outward.

The. reduced cnd l of the hammer piston 13 in entering the port produces snllicicnt, commession to at least equal that of the livc motive agent. the Ull ltlfl', being to steady the drill when in opcratioin as in this class of drills suspended or held up llfv a column of air in the feed cylinilcr the reliouud caused hy the sudden intake and exhaust oi the motive Force coupled with the rapid reciprocatina oi the lianeuer (Wt; to U l lilows per minute) causes a vihration very tiresome to thc operator. This arrange ment in my drill seems to have the desired eli'cct as it is unusually steady. By the use of the auxiliary liaust ports the hack pressure on the hammer is reduced by allowing: a small amount of exhaust to escape while mil 3' l li l' am mhmm imlm' llw Lma um"? landing-y ln'um El ll'n: (J'Ulb llwrcui'. and. 1 v V having 1: valve pm! l-xmling vmn.

Lil-0,136

finder at point above the said ir ner exhaust part, a laminar plstun reciprocating m the mid cylinrler, a main valve having a valve casing pmvided with ports and atfwthml 1.0 {ha inn' r and 0f Lhe cylinder, and i piszon lve xx prauating in the said valve (219mg. the said platen valve having three pawns .iltfnm in have and controlling the sa' .a casing ports, the latter connecting 2% Ah he and l 'llfillfii" 55 0215, @lllfilfittlt} valve w-nne a in'lotive agent supply and iln: said main valve, and a wounding the said valve casing :2 mufiler chamber! therel'Hifi'l" vxlmuvl. valve controlling the inlet and exhaust ports; 0f the cylinder, 2:, throttle valve 1;: having port; exmnd'ing theretllrough npening to the ninmnphere, a shell be- :nlur and the thmit-le. valve mmncling l'he admission mm 3 and synced therefrmh to f brin n yn fllvr ulim'mlm (mnnmnicating with gnu-m of the throttle valve casing, and

i l vi-v 1 the LYll means for .vm-nrnlg the thrnttle valve casing in he cylinder.

A power rock (lrlll, comprising a cylinder having longitudinal passages; ports leading; from said passages into the cylinder and :2 port, in lower end Wall, a hammer piston in the lfyllndfil' and having a reduced pulllfifl adapted to enlm' the port; in the end of the vyllndvl', a piston alve casing at the end 01" the Pylindvv and having a hora in twn (limm ilm's and ports lending! to the bore, pislm: YfXl-C in the bore and. hm ing three pistons fitting: F'Wd how, a throttle valve cusluz: hvlmv l'hu 1 an inlve ('2: ing and havin}: :1 31 m; lsmung la the ports of the said g-idlnn 21 j. :1 llu'ullle aluln flu casing wl :rmw i l fluid supp y nnrl nwuns lb: 15ml \nlw mining to U11:

tral bore of two diameters and a plurality of ports leading to the bore and a piston valve in the said bore and having three spaced pistons of which one is larger than the other two, said piston valve being adapted to close the port of the cylinder.

9. In a power rock drill, a cylinder having a port in one head, a hammer piston in the cylinder, and an admission and exhaust valve at the end of the cylinder having the port therein, said valve consisting of a valve casing having a central bore of two diameters and a chamber at one end, and a piston valve in the said bore and having three spaced pistons of which one is larger than the other two, the stem of the piston valve projecting below the lowermost piston into the said chamber and having a longitudinal passage leading out through its lower end and a transverse opening at the upper end of 20 the longitudinal passage, above the uppermost piston.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK PERLEY PORTER.

Witnesses:

ROBERT O. JONES, MARTIN NICHOLSON. 

